diff -r 5136f2fc32ec -r 26500fc24058 src/cx/printf.h
--- a/src/cx/printf.h	Sat Jan 13 17:51:42 2024 +0100
+++ b/src/cx/printf.h	Sun Jan 14 13:13:12 2024 +0100
@@ -44,6 +44,12 @@
 extern "C" {
 #endif
 
+
+/**
+ * The maximum string length that fits into stack memory.
+ */
+extern unsigned const cx_printf_sbo_size;
+
 /**
  * A \c fprintf like function which writes the output to a stream by
  * using a write_func.